bug#40728: 27.0.91; Removed public functions from debugger.el

[Eli Zaretskii]

> From: Gemini Lasswell <gazally@runbox.com>
> Cc: Philipp Stephani <p.stephani2@gmail.com>,  40728@debbugs.gnu.org
> Date: Mon, 27 Apr 2020 13:54:27 -0700
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Gemini, could you please write replacements for the functions you
> > removed, or defalias them to some equivalent replacements?  I agree
> > that public functions should not be removed, not without deprecating
> > them first (if indeed they don't make sense).
> 
> Here is a patch to bring those functions back.

Thanks!

Philipp, any comments?  If not, I'd like to install this on the
release branch.